Bump com.fasterxml.jackson:jackson-bom from 2.17.0 to 2.18.0 in /service

Bumps [com.fasterxml.jackson:jackson-bom](https://github.com/FasterXML/jackson-bom) from 2.17.0 to 2.18.0.
- [Commits](FasterXML/jackson-bom@jackson-bom-2.17.0...jackson-bom-2.18.0)

---
updated-dependencies:
- dependency-name: com.fasterxml.jackson:jackson-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

service/evaka-bom/build.gradle.kts

@@ -54,7 +54,7 @@ dependencies {
         api("org.apache.santuario:xmlsec:4.0.0")
     }
 
-    api(platform("com.fasterxml.jackson:jackson-bom:2.17.0"))
+    api(platform("com.fasterxml.jackson:jackson-bom:2.18.0"))
     api(platform("com.squareup.okhttp3:okhttp-bom:4.12.0"))
     api(platform("io.netty:netty-bom:4.1.108.Final")) // only needed for CVE fix
     api(platform("io.opentelemetry:opentelemetry-bom:1.42.0"))